Lobby group agree to abandon Left (8)
I believe the answer is:
campaign
'lobby' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for campaign that I've seen before include "Crusase, drive" , "Electioneer" , "(E.g. military, political) project" , "offensive" , "In election period" .)